Abstract: In order to figure out the characteristics of loading in a reverberation chamber, aiming at the defects of measurement of the quality factor in frequency and time domain, a series of measurements were taken into account. The mechanical stirring superposed with frequency stirring was proposed, which can reduce the dynamic deviation in frequency domain measurements. Furthermore, the dynamic deviation could decrease with the increasing of bandwidth of frequency stirring. A comparison between single-and double-antenna methods, the results show that both the two methods could provide the same quality factor in lower frequencies, however, the deviations couldn′t ignore in higher frequencies of single antenna method because of the increasing return loss, which can make the quality factor nearly 20% reduction. As a result, the measurement in time-domain should use double antennas.